*{
    margin: 0;
    padding: 0;
}
.content{
    position: relative;
    border:1px solid black;
    margin: 50px auto;
    width: 900px;
    height: 500px;
}
.content .left{
    position: absolute;
    border:1px solid black;
    top: 30px;
    left: 10px;
    width: 500px;
    height: 400px;

}
.content .right{
    border:1px solid black;
    position: absolute;
    top: 30px;
    right: 10px;
    width: 330px;
    height: 400px;

}
.left #btn{
    position: absolute;
    top: 10px;
    left: -175px;
}
.right{
    position: relative;
}
.right .ztree{
    position: absolute;
    top: 5px;
    left: 40px;
}

